President Joe Biden’s age and his handling of the economy are two of his greatest weaknesses as the 80-year-old incumbent gears up for a possible rematch with former President Donald Trump, a new poll showed Monday.Those major concerns could be what’s dragging Biden’s overall job approval underwater at 42%, versus some 57% who disapprove, according to the Wall Street Journal poll of 1,500 registered voters contacted Aug. 24-30.A 60% majority of registered voters indicated in the poll that they do not consider Biden “mentally up for the job” of being president. Nearly three-fourths of respondents, 73%, said they think Biden is too old to run for president — a much higher response than they gave Trump, who is 77 years old.The poll had a margin of error of 2.5 percentage points, according to the newspaper. It was conducted by Democratic pollster Michael Bocian and Tony Fabrizio, the former pollster for Trump’s 2016 campaign.Majorities of r …
